What I call the 1000 calorie bottle is basically a Nalgene bottle filled with a beverage that provides about 1000 calories.
In a 32oz Nalgene bottle add:
29g maltodextrin powder
1 scoop Cytomax
1.3c soy protein powder
Fill the rest of the bottle with water
The mix dissolves best in cold water, but I find that even if it clumps up at first it will end up well mixed after shaking around in my pack for a while.
This mix is intended to provide carbohydrates from the Maltodextrin powder and electrolyte replenishment and flavor from the Cytomax. The soy protein helps prevent the body from harvesting protein from muscles during sustained activity. One bottle is adequate to cover about 4 hours of activity without additional caloric intake.